Now, extract the contents into a folder, and copy everything into your "/username/half life 2/" folder EXCEPT the bin folder in the hl2 folder, this is 'cos the .dll in there is out of date or something so it'll stop cs from working :-s
Right, you should now have some files in your half life 2 folder, these'll be 2 .dll files, a file named convert.bat and then a couple more files.